Process for forming thread reserve windings



Jan. 29, 1963 T. HENSEN ETAL ,0

PROCESS FoR FORMING THREAD RESERVE wmomcs Filed Jan.' 22, 1958 2 Sheets-Sheet 1 INVENTORS. THEO HENSEN BY HEINRLCH BURKEL FIG?) ATT'YS Jan. 29, 1963 T. HENSEN ETAL 3,075,715

PROCESS FOR FORMING THREAD RESERVE wmomcs Filed Jan. 22,1958 2 Sheets-Sheet 2 FIG.4

INVENTORS: THEO HENSEN BY HEINRICH BURKEL ATT'YS United States 3,075,715 PRQCESS FOR F ][N G THREAD RESERVE WINDINGS Theo Hensen, Wuppertai-Barmen, and Heinrich Burke], Obernburg (Main), Germany, assiguors to Vereiuigte Glanzstolt-Fabriken AG., Wuppertal-Elberfeld, Ger- Filed Jan. 22, 1958, Ser. No. 710,477 Claims priority, application Germany Feb. 1, 1957 1 Claim. (Cl. 242-18) The invention, in general, relates to thread reserves associated with thread windings on spools or bobbins, and to processes and mechanisms for formation of said thread reserves on spools or bobbins in spinning, twisting and spoolin-g machines, and especially to those operations in which the thread to be wound is afiixed to a winding tube such as a rotating spool or bob-bin.

It is a known practice with spool and bobbin sleeves to form a thread reserve comprising a few windings separate from the main, wound, thread body. In the unwinding of the thread from the spool or bobbin, the thread end may be tied or otherwise connected with the beginning of another wound thread body on another spool or bobbin. In the usual spooling machines, in which the initial application of the thread to the spools or bobbins is accomplished at a standstill, the procedure is such that the free end of the thread is clamped between the bobbin or spool sleeve and sleeve carrier of the winding spindle, and before the spindle begins its rotation, the thread is placed in an auxiliary thread guide device. This device guides the thread for a predetermined number of turns on an area of the spool or bobbin outside the range of the main winding to be formed subsequently. When necessary the auxiliary thread guide device may also shift the thread path a short distance, whereupon the winding is then largely automatically taken 'over by the reciprocating thread guide. When, after the Winding process, the bobbin or spool sleeve is taken off the sleeve carrier, the free end at the beginning of the thread reserve is immediately exposed and acces sible.

The interchanging relationships, however, are different in windings on cone-shaped or cylindrical bobbins or spools in spinning, twisting or spooling machines in which the thread to be wound is supplied unin-terruptedly at a constant speed. Here it is impractical or impossible to stop the winding process briefly in order to clamp the thread between sleeve and sleeve carrier. When the continuously running thread is taken over by the empty sleeve, the empty sleeve must be running at full speed. Hitherto, after the applying of the thread on the rotating sleeve, which application is accomplished by a rapid looping of the thread around the sleeve by hand, the thread has been briefly held by hand outside the reciprocating mechanism so as to form first a thread reserve. Then the running thread is placed in the reciprocating mechanism to begin the main winding operation. The thread reserve so formed has a free end which is difiicult to locate because the free end is at the bottom of the reserve. In this procedure, it has often happened that, in the search for the first or one of the first reserve windings, one of the last has been taken, and subsequently an attachment of the thread winding to another winding was :made diflicult. Furthermore, the location of the beginning of the thread reserve winding always required a certain amount of time, which, as lost time adds disadvantageously to the production costs.

This invention obviates the drawbacks described above as follows: Besides the familiar thread reserve proper,

there is wound first in the proximity of the base of the sleeve an additional small auxiliary thread reserve, which ice lies between the main thread reserve and the sleeve edge. When the initial portion of the winding is sought, with such a thread reserve formation, it is merely neces sary to strip the auxiliary thread reserve from the sleeve in a simple manner, cut off the loop that arises, and the beginning of the main thread reserve is at hand.

Accordingly, it is an object of this invention to provide new thread windings including a main thread winding, a main thread reserve winding and an auxiliary thread reserve winding whereby the auxiliary reserve is utilized to provide the beginning of the main thread reserve windmg.

Another object is to provide winding processes which facilitate the location or finding of the beginning of the main thread reserve winding.

Still another object is to provide devices or mechanism for winding thread into a main thread body, a main thread reserve, and an auxiliary thread reserve. Other objects appear elsewhere in the instant specification.

The thread reserves according to the instant invention are produced in such a manner that the thread applied to the rotating winding base, e.g., a sleeve, in a familiar manner by rapid looping, by hand or by means of a suitable device, is, after the thread begins to be wound, first briefly guided adjacent to the sleeve edge for the formation of the auxiliary thread reserve winding and then, for a somewhat longer time, it is guided away from said edge for the main thread reserve formation. Then it is delivered to the reciprocating thread guide for the main winding. The auxiliary thread reserve produced in this manner is absolutely secure on the sleeve and cannot accidentally slip off during transport and other operations to which the cylindrical or coneshaped sleeve is subjected. On the other hand, however, this type of winding presents no ditficulties because one only has to strip off the auxiliary thread reserve in order to get hold of the beginning of the reserve proper.

For the production of the thread reserve according to the invention a mechanism is employed, which is characterized by the fact that on the machine frame or on the swinging reciprocating shutter, adjacent the sleeve carrier base, an auxiliary thread guiding device is pro vided. This device has two thread-contact surfaces spaced apart longitudinally of the sleeve the desired distance between the two thread reserves to be formed. When the thread is placed upon each suriace manually, it is recommended that the thread-contact surfaces be at different distances from the circumterence of the rotating sleeve, in which arrangement the thread-contact surface situated nearest to the sleeve carrier base preferably will be the closer surface to the circumference of the sleeve. This auxiliary thread guide device can be designed in a simple manner as a 'wire bent into V-shape with longer arm situated closest to the sleeve-carrier base, in which arrangement the thread can be laid once on the longer arm and then on the shortened branch or in the V-base of the wire.

"Instead of applying threads manually on the threadcontact surfaces, it is possible to mount an additional bar on a swinging shuttle, or other parts of the winding apparatus, such as the machine frame, with a slide moving on said bar and carrying an auxiliary thread guide. The slide is arranged to move along the bar toward one end of the spool or bobbin sleeve, and after placing the running thread in the auxiliary thread guide, the slide is positioned relative to the rotating spool or bobbin so as to form the two thread reserves. With this latter device the danger of possible hand injuries is avoided in the formation of the thread reserves according to the invention.

Specific embodiments of the invention herein con- 1 3 templated are described in further detail with the aid of the drawings, wherein the thread winding sleeve is shown, for purposes of illustration, in the form of a hollow cone bobbin.

In the drawings:

FIG. 1 shows a cone bobbin with the main winding, the main thread reserve and the auxiliary thread reserve;

FIG. 2 shows the same cone bobbin with the auxiliary thread reserve stripped off;

FIG. 3 shows one embodiment of apparatus for the formation of the main and auxiliary thread reserves;

FIG. 4 shows another embodiment of a similar device made of wire bent in V-shape;

FIG. 5 shows still another embodiment utilizing a slide device for the production of the thread reserve; and FIFIG. 6 shows section 6-6 through the mechanism of FIGS. 1 and 2 illustrate a hollow, frusto-conical sleeve 10 upon which is wound a main thread winding 12. A main thread reserve 14 and an auxiliary thread reserve 18 are wound about the sleeve 1) near the base thereof next to one another and are spaced apart so as to be separate windings. The two thread reserves are formed by rapidly looping the thread around the rotating sleeve at a position on the sleeve under what is to be the main thread windings, such as the position illustrated by the initial winding 16 in FIG. 3. After the thread begins to wind on the sleeve to form the initial winding 16, the thread path is shifted quickly toward the base of the sleeve 10 to first form the auxiliary thread reserve winding 18 at a point near the base of the sleeve. The auxiliary thread winding 18 illustrated in the drawings consists of about one full turn, but more turns may be employed to form the auxiliary thread reserve winding if desired. The initial winding 16 and the auxiliary thread reserve winding 18 are connected by the thread segment 29.

After the auxiliary thread reserve winding 18 is formed, the thread path is shifted a small distance in a direction away from the base of the rotating sleeve 16 to form the main thread reserve winding 14, which in the usual case will have a greater number of turns than the auxiliary winding and which is connected with the latter by thread segment 22. After the main thread reserve 14 is formed, the thread path is shifted to a reciprocating thread guide to begin the formation of the main winding 12, which is connected with the main thread reserve winding 14 by thread segment 24.

Thus, the thread winding of thi invention constitutes a single length of thread in which the thread winding is formed in the following order and proceeding from a point adjacent one end of a bobbin or spool in a direction away from said end: an auxiliary thread reserve winding 18 of one or a few turns, a main thread reserve winding 14 which, in the usual case, has a greater number of turns than the auxiliary thread reserve, and a main winding 12, which constitutes the bulk of the thread in the three separate, spaced windings. Described in another way, the windings of this invention constitute a continuous thread strand wound on a round-surfaced base member into three separate, spaced windings in the following order: an auxiliary thread reserve winding, a main thread reserve winding, and a main winding-the main thread reserve Winding being positioned, longitudinally of the base member, between the main winding and the auxiliary thread reserve winding.

To attach the wound thread to another length of thread, the auxiliary thread reserve 18, before the attachment of the following thread, is stripped from sleeve 10. The loop 28 (see FIG. 2), derived from the auxiliary thread reserve, is cut, whereupon segment 22 is exposed as the beginning of the thread reserve proper and can be drawn off to provide a transfer tail for attachment to the succeeding thread.

In FIG. 3, sleeve 10 is placed on sleeve carrier 3%, whose sleeve carrier base 32 is illustrated as projecting slightly from sleeve 10. The device of this embodiment for the formation of the dual thread reserve consists of a guiding plate 34 (attached to the machine frame 36, shown only in segment), which has two contact surfaces 38 and 4t) for forming the thread reserves. To form the thread reserves, the thread, rapidly looped about rotating s.eeve 2th at 16, is then moved by hand in the path illustrated by the broken line 42 in the direction of the arrow into contact with the thread guiding contact surface 38 for a short time and, immediately thereafter, into contact with thread guiding contact surface 40, where it is held for one to two seconds. The running thread is then placed in any of the familiar reciprocating mechanisms for reciprocating the thread to wind it in even layers. The two thread contact surfaces 38 and 40 of the auxiliary guiding device 34 are so designed that the contact surface 38, against which the thread is first pressed for the formation of the auxiliary thread reserve 13, is the closer guiding surface to the rotating bobbin, while the guiding surface 49 is at a greater distance from the rotating bobbin in order to make possible a perfect passage of the thread.

In FIG. 4, the auxiliary guiding device 50 is a wire bent into V-shape, which has a longer arm 52 and a shorter arm 54. In this illustration, the guiding wire 50 is attached to a pivotable shuttle 56, which carries a pressure roller 58 and a reciprocating thread guide 60, which is reciprocated by any conventional mechanism (not shown). Like the embodiment of FIG. 3, the thread is guided by hand, after looping around sleeve 10 at 16, first to thread contact point 62. By holding the thread at this point for a short time, the auxiliary thread reserve 18 is formed. Then the thread path is shifted to thread contact 64, whereupon the main thread reserve 14 is formed. After the main thread reserve is formed, the running thread is shifted to the thread guide 69, whereupon the main winding begins. In FIG. 4, the second thread contact surface is positioned in the notch of wire 50. It is, however, also conceivable that this contact surface may be provided on the shortened arm 54, if desired.

In the embodiment of FIGS. 5 and 6, a bar is mounted on the pivotable shuttle 56 adjacent the thread guide 60. On the bar 70 is mounted a slide rod 72 on which is slidably mounted a slide 74. The slide 74 has two prongs 76forming a thread guide therebetween. The slide 74 has a round friction bar mounted at a corner thereof, and its function is to provide a smooth contact surface for the running thread. To form the thread reserves, the thread is placed between the slide prongs 72 with the slide in the position 78 shown in dotted lines. The slide is then pushed by hand, using handle 36, toward the right against stop 82. In the process, a coil spring 84 is compressed. When the hand is removed after adequate formation of the auxiliary thread reserve 13, the slide 74 snaps back into the slide position illustrated in solid lines (FIG. 5) where, by means of a suitable rest device such as a spring-loaded ball 86 mounted in the bar 70, it comes to rest to form the main thread reserve 14. From here on, the thread can then be taken out of the slide by hand and placed in the reciprocating thread guide 60. By means of the auxiliary device of FIGS. 5 and 6, an especially precisely regulated auxiliary thread reserve 18 can be achieved on the sleeve. Furthermore, the danger of injuries to the operating personnel is reduced to a minimum.

The thread reserves shown in the drawings, their method of production and the devices drawn and described as examples, do not exhaust the modifications to which this invention is susceptible. It is possible, for example, to move the auxiliary thread reserve closer to the main thread reserve or it can be further removed. The auxiliary thread reserve may consist of less or of more than one thread looping, and the parts of the mechanism that serve for the brief guidance of the thread may be differently designed and arranged.

The invention is hereby claimed as follows:

In a process for winding thread on a spool and subsequent attachment thereof to another thread, the steps comprising looping the thread about a rotating spool mounted on a rotating member to begin an initial winding of the thread on said spool, then conducting the thread path adjacent an edge of said rotating spool and forming a small, auxiliary thread reserve winding adjacent said edge, then shifting the thread path in a direction away from said edge and forming a main thread reserve winding spaced from said auxiliary thread reserve winding, and thereafter forming a main winding spaced from and adjacent to said main thread reserve winding and over said initial winding until a full spool is wound, subsequently unwinding the thread from said full spool, slipping the loops of said auxiliary thread reserve winding off the edge of said spool, and severing the resultant thread loop formed by the auxiliary thread reserve winding to divide said resultant thread loop into a thread portion integral with said initial winding and another thread portion integral with said main thread reserve winding, the latter portion providing a readily locatable, free end for the main thread reserve winding when said main thread re serve winding is used to provide a transfer tail for said main winding used in the attachment of the thread wound in said main Winding to an end of another thread.

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